Pascal Macha
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Pascal Macha has a total of 9 co-authors. Here are the top co-authors by number of shared publications:
- Alexey Valentinovich Ustinov
Physikalisches Institut, Karlsruher Institut für Technologie 1 , Karlsruhe
1 shared publication Evgeni Il’iChev
Leibniz Institute of Photonic Technology, PO Box 100239, D-07702 Jena, Germany
1 shared publicationGerd Schön
Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
1 shared publication- Gregor Oelsner
Leibniz Institute of Photonic Technology
1 shared publication Hans-Georg Meyer
Leibniz Institute of Photonic Technology, PO Box 100239, D-07702 Jena, Germany
1 shared publicationJan-Michael Reiner
Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
1 shared publication
Latest Publications
- Open Access
- 14 October 2014
- Published by Springer Nature in Nature Communications
- Vol. 5 (1) , 5146
Implementation of a quantum metamaterial using superconducting qubits
The key issue for the implementation of a metamaterial is to demonstrate the existence of collective modes corresponding to coherent oscillations of the meta-atoms. Atoms of natural materials interact with electromagnetic fields as quantum two-level systems. Artificial quantum two-level systems can be made, for example, using superconducting nonlinear resonators cooled down to their ground state. Here we perform an experiment in which 20 of these quantum meta-atoms, so-called flux qubits, are embedded into a microwave resonator. We observe the dispersive shift of the resonator frequency imposed by the qubit metamaterial and the collective resonant coupling of eight qubits. The realized prototype represents a mesoscopic limit of naturally occurring spin ensembles and as such we demonstrate the AC-Zeeman shift of a resonant qubit ensemble. The studied system constitutes the implementation of a basic quantum metamaterial in the sense that many artificial atoms are coupled collectively to the quantized mode of a photon field.
- 14 October 2014
- Published by Springer Nature in Nature Communications
- Vol. 5 (1) , 5146
Open AccessImplementation of a quantum metamaterial using superconducting qubits
The key issue for the implementation of a metamaterial is to demonstrate the existence of collective modes corresponding to coherent oscillations of the meta-atoms. Atoms of natural materials interact with electromagnetic fields as quantum two-level systems. Artificial quantum two-level systems can be made, for example, using superconducting nonlinear resonators cooled down to their ground state. Here we perform an experiment in which 20 of these quantum meta-atoms, so-called flux qubits, are embedded into a microwave resonator. We observe the dispersive shift of the resonator frequency imposed by the qubit metamaterial and the collective resonant coupling of eight qubits. The realized prototype represents a mesoscopic limit of naturally occurring spin ensembles and as such we demonstrate the AC-Zeeman shift of a resonant qubit ensemble. The studied system constitutes the implementation of a basic quantum metamaterial in the sense that many artificial atoms are coupled collectively to the quantized mode of a photon field.